378 MINNESOTA BOTANICAL STUDIES. 



1038. Plummer, J. T. Suburban Geology, or Rocks, Soil 

 and Water, about Richmond, Wayne county, Indiana. Am. 

 Jour. Sci. Arts. 44:281-313.^/. JaPMrl843. 



Four species of Fucoicles are figured and discussed. 



1039. Pont, P. R. B. de. J. Brun's Prei^aration of Diatoms. 

 Jour, of Microg.— (The Microscope. 2 : 191. F1883. ) 



1040. Porter, E. D. Investigations of Supposed Poisonous 

 Vegetation in the Waters of some of the Lakes of Minnesota. 

 Fourth Bien. Rep. Bd. Regents Univ. of Minn. Suppl. I. Rep. 

 Dept. Agric. Univ. of Minn. 95, 96. 1887. 



1041. Poteat, W.L. A Preliminary List of North Carolina 

 Desmids. Jour. Elisha Mitchell Sci. Soc. 5:1-4. 1888.— (The 

 Microscope. 9:123, 124. Apl889.) 



Eighty-one species listed. 



1042. Pound, R. The Algae, Fungi and Lichens. Am. 

 Nat. 23:178. F1889. 



. See Smith, J. G. and Pound, R. 



1043. Preston, E. B. Diatomaceous Earth. Cal. St. Min. 

 Bureau. 10th Ann. Rep. St. Miner. 1890:282. 1890. 



Mentions a deposit in Lassen county. 



1044. Prinz, W. Notes on Manner of obtaining Sections of 

 Diatoms.— (Bot. Gaz. 9:32. F1884.) 



1045. Provancher, L, Flora Canadienne, ou Description 

 de toutes les Plantes des Forets, Champs, Jardins, et Eaux du 

 Canada. 8vo. 2 vol. i-xxix. 1-842. 1862. Quebec. 



1046. Puiggari, J. J. Noticia sobre algunas Cryptogamas 

 nuevas halladas en Apiahy, provincia de San Pablo en el Brasil, 

 Anales Soc. cien. Argentin. II: entr. 4. 1 — 16. 1881.— (Bot. 

 Centralb. 8:161. 1881.) 



1047. Puysegur, M. and Ryder, J. A. On the cause of the 

 Greening of Oysters. With a Supplementary Note on the Col- 

 oration of the Blood Corpuscles of the Oyster. U. S. Comm. 

 Fish and Fisheries. Part X. Rep. Comm. 1882. 793-805. 1884. 



1048. Queen, T. W, Glass Discs for arranging Diatoms. 

 Mic. Bull. 2 : 24. 1885. 



1049. Quekett, E. J. Observations on. the Species of 

 Fossil Animalcules discovered at Petersburgh in Virginia. 

 Lond. Phys. Jour. 1 : 140. 1846. 



1050. Quekett, J. On the presence, in the Northern Seas, 

 of Infusorial Animals analogous to those occurring in a Fossil 



